A 73-year-old man with a known history of hypertension and gout was admitted into hospital having had chest and epigastric discomfort for 3 days. His chest discomfort was not related to exertion, and there was no recent history of antibiotic or non-steroidal anti-inflammatory drug intake. His bowel habit was normal. Physical examination was unremarkable except for mild ankle oedema. Per rectum examination revealed brownish stool and no mass was felt.

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